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YaIoTClient.cs
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YaIoTClient.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Security;
using System.Net;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;
using System.Threading;
using System.Threading.Tasks;
using MQTTnet;
using MQTTnet.Client;
using MQTTnet.Client.Connecting;
using MQTTnet.Client.Disconnecting;
using MQTTnet.Client.Options;
using System.Security;
namespace IoTSimulation
{
public enum EntityType
{
Registry = 0,
Device = 1
}
public enum TopicType
{
Events = 0,
Commands = 1
}
class YaIoTClient : IDisposable
{
public const string MqttServer = "mqtt.cloud.yandex.net";
public const int MqttPort = 8883;
private static X509Certificate2 rootCrt = new X509Certificate2("Data/rootCA.crt");
public static string TopicName(string entityId, EntityType entity, TopicType topic)
{
string result = (entity == EntityType.Registry) ? "$registries/" : "$devices/";
result += entityId;
result += (topic == TopicType.Events) ? "/events" : "/commands";
return result;
}
public delegate void OnSubscribedData(string topic, byte[] payload);
public event OnSubscribedData SubscribedData;
private IMqttClient mqttClient = null;
private ManualResetEvent oCloseEvent = new ManualResetEvent(false);
private ManualResetEvent oConnectedEvent = new ManualResetEvent(false);
private IMqttClientOptions connProps = null;
public void StartCert(string certPath, string certPassword)
{
X509Certificate certificate;
if (string.IsNullOrEmpty(certPassword)){
certificate = new X509Certificate(certPath);
}else{
SecureString secPwd = new NetworkCredential("",certPassword).SecurePassword;
certificate = new X509Certificate(certPath, secPwd);
}
List <X509Certificate> certificates = new List<X509Certificate>();
certificates.Add(certificate);
//setup connection options
MqttClientOptionsBuilderTlsParameters tlsOptions = new MqttClientOptionsBuilderTlsParameters
{
Certificates = certificates,
SslProtocol = SslProtocols.Tls12,
UseTls = true
};
tlsOptions.CertificateValidationCallback += CertificateValidationCallback;
// Create TCP based options using the builder.
var options = new MqttClientOptionsBuilder()
.WithClientId($"Test_C#_Client_{Guid.NewGuid()}")
.WithTcpServer(MqttServer, MqttPort)
.WithTls(tlsOptions)
.WithCleanSession()
.WithCommunicationTimeout(TimeSpan.FromSeconds(90))
.WithKeepAlivePeriod(TimeSpan.FromSeconds(90))
.WithKeepAliveSendInterval(TimeSpan.FromSeconds(60))
.Build();
var factory = new MqttFactory();
mqttClient = factory.CreateMqttClient();
mqttClient.UseApplicationMessageReceivedHandler(DataHandler);
mqttClient.UseConnectedHandler(ConnectedHandler);
mqttClient.UseDisconnectedHandler(this.DisconnectedHandler);
Console.WriteLine($"Connecting to mqtt.cloud.yandex.net...");
this.connProps = options;
mqttClient.ConnectAsync(this.connProps, CancellationToken.None);
}
public void StartPwd(string id, string password)
{
//setup connection options
MqttClientOptionsBuilderTlsParameters tlsOptions = new MqttClientOptionsBuilderTlsParameters
{
SslProtocol = SslProtocols.Tls12,
UseTls = true
};
tlsOptions.CertificateValidationCallback += CertificateValidationCallback;
// Create TCP based options using the builder.
var options = new MqttClientOptionsBuilder()
.WithClientId($"Test_C#_Client_{Guid.NewGuid()}")
.WithTcpServer(MqttServer, MqttPort)
.WithTls(tlsOptions)
.WithCleanSession()
.WithCredentials(id, password)
.WithKeepAlivePeriod(TimeSpan.FromSeconds(90))
.WithKeepAliveSendInterval(TimeSpan.FromSeconds(60))
.Build();
var factory = new MqttFactory();
mqttClient = factory.CreateMqttClient();
mqttClient.UseApplicationMessageReceivedHandler(DataHandler);
mqttClient.UseConnectedHandler(ConnectedHandler);
this.connProps = options;
mqttClient.UseDisconnectedHandler(this.DisconnectedHandler);
Console.WriteLine($"Connecting to mqtt.cloud.yandex.net...");
mqttClient.ConnectAsync(options, CancellationToken.None);
}
public void Stop()
{
oCloseEvent.Set();
mqttClient.DisconnectAsync();
}
public void Dispose()
{
Stop();
}
public bool WaitConnected()
{
WaitHandle[] waites = { oCloseEvent, oConnectedEvent };
return WaitHandle.WaitAny(waites) == 1;
}
public Task Subscribe(string topic, MQTTnet.Protocol.MqttQualityOfServiceLevel qos)
{
return mqttClient.SubscribeAsync(topic, qos);
}
public Task Publish(string topic, string payload, MQTTnet.Protocol.MqttQualityOfServiceLevel qos)
{
return mqttClient.PublishAsync(topic, payload, qos);
}
private Task ConnectedHandler(MqttClientConnectedEventArgs arg)
{
oConnectedEvent.Set();
return Task.CompletedTask;
}
private Task DisconnectedHandler(MqttClientDisconnectedEventArgs arg)
{
Console.WriteLine($"Disconnected mqtt.cloud.yandex.net.");
if (arg.Exception != null && !string.IsNullOrEmpty(arg.Exception.Message))
Console.WriteLine($"Error {arg.Exception.Message}");
Thread.Sleep(5000); // Wait 5 sec before next connection attempt
Console.WriteLine($"Trying reconnect");
this.mqttClient.ConnectAsync(this.connProps, CancellationToken.None);
return Task.CompletedTask;
}
private Task DataHandler(MqttApplicationMessageReceivedEventArgs arg)
{
SubscribedData(arg.ApplicationMessage.Topic, arg.ApplicationMessage.Payload);
return Task.CompletedTask;
}
private static bool CertificateValidationCallback(X509Certificate cert, X509Chain chain, SslPolicyErrors errors, IMqttClientOptions opts)
{
try
{
if (errors == SslPolicyErrors.None)
{
return true;
}
if (errors == SslPolicyErrors.RemoteCertificateChainErrors)
{
chain.ChainPolicy.RevocationMode = X509RevocationMode.NoCheck;
chain.ChainPolicy.VerificationFlags = X509VerificationFlags.NoFlag;
chain.ChainPolicy.ExtraStore.Add(rootCrt);
chain.Build((X509Certificate2)rootCrt);
var res = chain.ChainElements.Cast<X509ChainElement>().Any(a => a.Certificate.Thumbprint == rootCrt.Thumbprint);
return res;
}
}
catch { }
return false;
}
}
}